Combined forged draft and convec



Feb. 28, 1950 K. s. JENSON' COMBINED FORCED DRAFT AND CONVECTION AIR FLOW SPACE HEATER 3 Sheets-Sheet 1 Filed 001,. 2, 1944 INVENTOR. fiiezzrzeZ/z 5 Jenaon,

Feb. 28, 1950 K. s. JENSON 2,499,067

COMBINED FORCED DRAFT AND CONVECTION AIR FLOW SPACE HEATER Filed Oct. 2, 1944 3 Sheets-Sheet 2 IN V EN TOR.

Feb. 28, 1950 K. s. JENSON 2,499,067

COMBINED FORCED-DRAFT AND CONVECTION AIR FLOW SPACE HEATER Filed Oct. 2, 1944 3 Sheets-Sheet 3 2a IN V EN TOR.

ffezzrzeZ/z 5 $526072,

Patented Feb. 28, 1950 COMBINEDFORCED DRAFT AND CONVEC- TION AIR FLOW SPACE. HEATER Kenneth S. Jonson, Wisconsin Rapids, Wis.,

assignor to Prentiss Wabers" Produ'ctsGo.,,Wisconsin Rapids,.Wis., a corporationrof Wisconsin Application October 2, 1944', ScriaINo. 556,703

( Cl. 126-11(l) 3 Claims;

The present invention relates to improvements in space heaters.

In the use of ordinary space heaters-attempts have been made to circulate the heated air from a burner along the floor with the idea that the heated air will rise and be distributed through the room. According to prior practice it has been common to direct heatedair from the lower region of a space heater, and even though this heated air has been blower driven it has not progressed any great distance from theheater before it has tended to rise, so that the distribution of the heated air is rather poor. Moreover, the exit of the heated air from the burner has been through doors which direct the air in more or less narrow streams, which have not been effective.

The present invention contemplates a construction of space heater in which the heated air is circulated through the heater toa duct atthetop thereof, whence the heated air is deflected downwardly to the far-side of the room in which the heater is located.

An object of the present invention is to provide an improved space heater which will supply heated air to the surrounding space with improved uniformity over prior practice.

A further object is. to provide arr-improved space heater in which the heatedair is directed from the upper hotter region of the space heater, said heated air being deflected-- downwardly into the space surrounding said heater.

A further object is to provide an improved space heater for delivering air which is comfortable to persons located in the room in whichthe space heater is located.

Further objects will appear as thedescription proceeds.

Referringto the drawings.

Figure 1' is a rear elevational- View of one embodimentof the present invention;

Figure 2 is a plan section taken alongthe plane indicated by the arrows-2-2 of Figure 1;

Figure 3 is an elevational section taken along the plane indicated by the arrows 33 of Figure 2;

Figure 4 illustrates, on an enlarged scale, a detail of construction of the preceding figures, said view being taken in the direction of the arrow 4 in Figure 3;

Figure 5 is a sectional. view taken along the plane indicated by the arrows 5-5 of Figure 4 and the arrows 55 of Figure 6;

Figure 6 is a sectional view taken along the plane indicated by the: arrows &'6 oirFigure 4;

Figure-7' is'a rear view inele-vation of a modified construction Figure-Sis a plan section taken along the plane indicated by the arrows 8-8 of Figure 7; and

Figure 9' is" an elevational' section taken along the planeindicated by the arrows 9-40: Figure 7-;

Referring first to-Figures-l, 2 and 3, the numeral i-B indicat'esa casing adapted for the'circul ation ofai-r. Located within said casing is" the heat drum H; which is illustrated as being of generally cylindrical contour. Located adjacent to the bottom of said heat drum H is a burner (not illustrated), and" located at thesid'e of said heat drum isthe outlet fluel2 for the discharge of products of combustion from said burner. The heat drum- H may have an imperf'orat'etop,- but the top of the casing I0 will preferably be pro vided with apertures preferably controllable in extent for permitting the escape of a portion of the air w'hichhascirculated up th-rou-gh the casing 10 exteriorly -of the heat-drum II Figures 1' and 3 i-llustrat'ea conventional sliding shutter Ha for controlling such apertures;

Located above the heat drum H is the heat conduit meansor duct 13, a preferred contour of which is illustrated in Figures 1', 2 and 3". The forward end of said duct i3 isdownwardly inclined, asindicated by the numeral l3a;. Said dbwnwardly inclined end [3a leads to the outlet or nozzle l4. Said duct l3 providesa passageway for heated air from the'v-icin-ity of the topof the heat drum H through an opening I 5' tothe blower l6, which blower communicates with the inlet end of the duct H. The blower 5* is" driven by a motor' (not illustrated) located outside of the casing to: and therefore protected from the radiant heat from the heat drum- I The openi-ng I5" is controlled by the damper H, which is suspended frcin the rod 58 slidably mounted in a sleeve. ['9 mounted at the topof' the. blower 1-6; A handle 20 is providedtfor'moving the rod ii8and consequently the damper It to control access. of air from the: region adjacent to the top portion-of the: heat drum. H through" the opening I5- to the blower Hi and duct-l-'3 and out through the: nozzle Figures 4,5 and 6 illustrate a direction control which may be used for distributing the air from the downwardly directed end [3a of the duct l3; Figure 6'illustrates how the outer extremity of the portion [3a of the duct 83' may be disposed in overlapping relationship with the metal of the casing Hi boundingthe nozzle M; Disposed crosswise-of the nozzle l4 ina horizontal direction are the relatively stationary vanes- ZI -Z I, having their fiat sides generally parallel with the flow of air through said portion l3a. The numerals 22-22 indicate adjustable vanes mounted to swing about the pins 2323, which pins are carried by the upper and lower walls of the portion l3a of the duct 13. Said adjustable vanes 22 may be individually adjusted to send air at any desired angle in a crosswise direction within the limits of the discharge nozzle l4. As illustrated in Figure 2, the downwardly directed portion l3a of the duct [3 is flared horizontally to deliver the heated air with a fan-shaped distribution.

Figures 7, 8 and 9 illustrate a slight modification of the structure illustrated in Figures 1, 2 and 3. In Figures '7, 8 and 9 an enclosed motor 24 is disposed within the blower housing 25, which takes air in the direction of the arrows from the region adjacent to the top of the heat drum I l and delivers said air to the duct i3 having the downwardly directed outlet portion 13a. The motor 24 may be controlled by a multiple-speed switch of the usual type. Such a switch is indicated by the numeral-26. The construction illustrated in Figures '7, 8 and 9 differs from the construction illustrated in the preceding figures in that the upper wall of the portion l3a of the duct I 3 is provided with a downwardly directed lip l3b to aid in deflecting the heated air from the top of the heat drum H downwardly to the space in front of the casing in. motor (not illustrated) located on the outside of the blower i6, is protected against radiant heat from the heat drum II in order to protect the motor windings. The casing I is illustrated in Figure 9 with a conventional inlet opening 24a for the admission of air to the space between the casing Ill and the drum 1 I.

In operation a portion of the heat circulated about the heat drum i will be discharged through the top of the casing [0. When the blower I6 (Figs. 1 to 6) or the blower 25 (Figs. '7 to 9) is running, part of the heated air is directed through the duct [3 and is discharged outwardly and downwardly into the room through the nozzle [4. The heated air leaves the nozzle M at high velocity and can be forced completely across a room of ordinary size. If it is desired to reduce the velocity of the air leaving the nozzle M, the damp-er l1 (Figs. 1 and 2) may be moved closer to the opening l5, thus restricting the air entering the blower. In the construction illustrated in Figures 7 to 9 the air fiow may be controlled by operation of the multiple-speed switch 26.

The blower it (Figs. 1 to 6) and the blower 25 (Figs. 7 to 9) are so located that they draw the heated air near the top of the heating drum H, directing said heated air over the top of said heating drum in the hottest zone of the heater. Accordingly, air heated to the greatest extent in the heater is delivered by the blower regardless of the rate of firing of the burner.

During tests, temperatures of the delivered air have ranged from 110 F. to 190 F. when operating the heater throughout the full range of fuel control. Heaters of other types have delivered air at a maximum temperature of 150 F. and a minimum temperature of 70 F. Air at 70 F. or colder moved rapidly across a room produces a cold, clammy feeling. According to the present invention, no such feeling is encountered even at low firing rates. Considering conditions at high firing rates, air that leaves the blower nozzle at 190 F. is too warm for a person located directly in its path near the heater, but as such air mixes The enclosed motor 24, as well as the 4 with the colder room air the resulting temperature is comfortable.

Though certain preferred embodiments of the present invention have been described in detail, many modifications will occur to those skilled in the art. It is intended to cover all such modifications that fall within the scope of the appended claims.

What is claimed is:

1. In a space heater, in combination, a casing, a heating drum disposed within said casing in position to provide a space between said drum and said casing for heated air, conduit means extending across said casing in the region closely adjacent to the top of said drum, blower means for forcing air through said conduit means, said blower means having an intake communicating with the upper region of said space for heated air and having an outlet communicating with one end of said conduit means, said conduit means having its other end downwardly directed for directing heated air from said blower means in a downward direction from the upper portion of said casing to the exterior of said casing, said casing being provided with an opening to admit air to the space between said casing and said drum, the top of said casing being apertured to permit the escape of heated air from said casing, and means for controlling the amount of heated air delivered by said blower means to said conduit means.

2. In a space heater, in combination, a casing, a heating drum disposed within said casing in position to provide a space between said drum and said casing for heated air, conduit means extending across said casing in the region closely adjacent to the top of said drum, blower means for forcing air through said conduit means, said blower means having an intake communicating with the upper region of said space for heated air and having an outlet communicating with one end of said conduit means, said conduit means having its other end downwardly directed for directing heated air fro-m said blower means in a downward direction from the upper portion of said r casing to the exterior of said casing, said casing being provided with an opening to admit air to the space between said casing and said drum, the top of said casing being provided with apertures controllable in extent for permitting the escape of a portion of the air from said casing.

3. In a space heater, in combination, a casing, a heating drum disposed within said casing in position to provide a space between said drum and said casing for heated air, conduit means extending across said casing in the region closely adjacent to the top of said drum, blower means for forcing air through said conduit; means, said blower means having an intake communicating with the upper region of said space for heated air and having an outlet communicating with one end of said conduit means, said conduit means having its other end downwardly directed for directing heated air from said blower means in a downward direction from the upper portion of said casing to the exterior of said casing, said casing being provided with an opening to admit air to the space between said casing and said drum, the top of said casing being provided with apertures controllable in extent and means for controlling the amount of heated air delivered by said blower means to said conduit means.

KENNETH S. J ENSON.

(References on following page) 5 REFERENCES CITED Number The following references are of record in the file of this patent: 2,304,570 UNITED STATES PATENTS 5 2,337,676 Number Name Date 2348127 805,247 Thompson Nov. 21, 1905 1,169,448 Williams Jan. 25, 1916 2,001,531 Hall May 14, 1935 figff Sadwith Sept. 24, 1935 Name Date Sheffield May 26, 1936 Logue Nov. 18, 1941 Jain Dec. 8, 1942 Mirra Dec. 28, 1943 Grimes May 2, 1944 FOREIGN PATENTS Country Date Great Britain Nov. 1, 1934 

